{"id":"CVE-2026-45159","state":"PUBLISHED","title":"Nextcloud: Files drop share links for end-to-end encrypted folders allowed to drop files into other folders of the share owner","description":"Nextcloud is an open source content collaboration platform. From versions 1.15.0 to before 1.15.4, 1.16.0 to before 1.16.3, 1.17.0 to before 1.17.1, and 1.18.0 to before 1.18.1, a malicious user with access to an end-to-end encrypted files drop link was able to also drop files into other end-to-end encrypted folders of the share owner. Reading and modifying of other files was not possible. This issue has been patched in versions 1.15.4, 1.16.3, 1.17.1, 1.18.1, and 2.0.0-rc.7.","publishedAt":"2026-06-01T16:39:38.836Z","updatedAt":"2026-06-01T19:30:25.192Z","severity":{"score":3.5,"label":"Low","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["nextcloud security-advisories"],"affected":[{"vendor":"nextcloud","product":"security-advisories","versions":[{"version":">= 1.15.0, < 1.15.4","status":"affected"},{"version":">= 1.16.0, < 1.16.3","status":"affected"},{"version":">= 1.17.0, < 1.17.1","status":"affected"},{"version":">= 1.18.0, < 1.18.1","status":"affected"}]}],"references":["https://github.com/nextcloud/security-advisories/security/advisories/GHSA-p3qw-7gwx-wg24","https://github.com/nextcloud/end_to_end_encryption/pull/1395","https://hackerone.com/reports/3304830"],"weaknesses":["CWE-639"],"ingestedAt":"2026-10-29T20:12:07.131Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/45xxx/CVE-2026-45159.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-45159","state":"PUBLISHED","datePublished":"2026-06-01T16:39:38.836Z","dateUpdated":"2026-06-01T19:30:25.192Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-05-08T20:44:38.965Z"},"containers":{"cna":{"title":"Nextcloud: Files drop share links for end-to-end encrypted folders allowed to drop files into other folders of the share owner","descriptions":[{"lang":"en","value":"Nextcloud is an open source content collaboration platform. From versions 1.15.0 to before 1.15.4, 1.16.0 to before 1.16.3, 1.17.0 to before 1.17.1, and 1.18.0 to before 1.18.1, a malicious user with access to an end-to-end encrypted files drop link was able to also drop files into other end-to-end encrypted folders of the share owner. Reading and modifying of other files was not possible. This issue has been patched in versions 1.15.4, 1.16.3, 1.17.1, 1.18.1, and 2.0.0-rc.7."}],"affected":[{"vendor":"nextcloud","product":"security-advisories","versions":[{"version":">= 1.15.0, < 1.15.4","status":"affected"},{"version":">= 1.16.0, < 1.16.3","status":"affected"},{"version":">= 1.17.0, < 1.17.1","status":"affected"},{"version":">= 1.18.0, < 1.18.1","status":"affected"}]}],"references":[{"url":"https://github.com/nextcloud/security-advisories/security/advisories/GHSA-p3qw-7gwx-wg24","name":"https://github.com/nextcloud/security-advisories/security/advisories/GHSA-p3qw-7gwx-wg24","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/nextcloud/end_to_end_encryption/pull/1395","name":"https://github.com/nextcloud/end_to_end_encryption/pull/1395","tags":["x_refsource_MISC"]},{"url":"https://hackerone.com/reports/3304830","name":"https://hackerone.com/reports/3304830","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":3.5,"baseSeverity":"LOW","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-639","lang":"en","description":"CWE-639: Authorization Bypass Through User-Controlled Key","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-06-01T16:39:38.836Z"},"source":{"advisory":"GHSA-p3qw-7gwx-wg24","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-06-01T19:30:14.088508Z","id":"CVE-2026-45159","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-06-01T19:30:25.192Z"}}]}}}